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Packaging body, method for storing or transporting polyvinyl alcohol-based film, polyvinyl alcohol-based film, and polarizing film

A polyvinyl alcohol-based and packaging technology, which is applied in packaging, transportation and packaging, and special packaging objects, etc., can solve the problems of uneven polarization, uneven color, and film deformation of polarizing films, and achieve easy unwinding and improved Productivity, effect of roll offset prevention

Pending Publication Date: 2018-07-31
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because if the moisture content of the polyvinyl alcohol-based film fluctuates greatly during storage or transportation, or if the moisture content in the film surface becomes uneven, not only the film will be deformed but also the optical properties in the film surface will change, and the resulting polarizing film will be polarized. Degree unevenness (in-plane unevenness of polarization degree), color unevenness

Method used

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  • Packaging body, method for storing or transporting polyvinyl alcohol-based film, polyvinyl alcohol-based film, and polarizing film
  • Packaging body, method for storing or transporting polyvinyl alcohol-based film, polyvinyl alcohol-based film, and polarizing film
  • Packaging body, method for storing or transporting polyvinyl alcohol-based film, polyvinyl alcohol-based film, and polarizing film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0174] (manufacturing of film rolls)

[0175] Add 1000kg of polyvinyl alcohol-based resin with a weight average molecular weight of 142000 and a saponification degree of 99.8 mol%, 2500kg of water, and 100kg of glycerin as a plasticizer, and heat up to 140°C while stirring, and adjust the concentration to a resin concentration of 25% by weight to obtain a uniform Dissolved polyvinyl alcohol-based resin aqueous solution.

[0176] Next, after supplying the aqueous solution of polyvinyl alcohol-based resin to a twin-screw extruder for defoaming, the temperature of the aqueous solution was set at 95°C, and it was sprayed and cast on a pouring drum with a surface temperature of 90°C from a T-shaped slot die outlet. to film.

[0177] Next, the obtained film was dried with a plurality of metal heating rolls, heat-treated using a suspension dryer, and cut to a width of 4 m by a cutter. Finally, it was wound up on an aluminum core pipe with an outer diameter of 17 cm, an inner diamet...

Embodiment 2

[0187] As the water vapor barrier film, a laminate with a hygroscopic film (NS-APP manufactured by Nissin Seal Industry Co, Ltd.) was used, and the humidity-conditioning sheet was not used, and the packaging was carried out in the same manner as in Example 1. production, storage, and production of polarizing films. The results are shown in Table 1 and Table 2.

Embodiment 3

[0189] As a water vapor barrier film, a laminated film of aluminum-deposited polyester film (polyethylene terephthalate film, 12 μm thick) and polyethylene film (25 μm thick) was prepared, and the packaging A humidity indicator (manufactured by Fujita Electric Manufacturing Co., Ltd., "WATCHLOGGER KT-275") was pasted on the polyethylene side of the inner surface.

[0190] Next, in an environment of 23° C. and 50% RH, two layers of the above-mentioned water vapor barrier film were wound on the film roll of Example 1 with the polyethylene film inside. The axial end of the core tube in the water vapor barrier film was fixed to the outer periphery of the end of the core tube protrusion (0.2 m at both ends) with a rubber band, and the remaining part of the water vapor barrier film was wrapped around the core tube. The way the ends fold into the inside of the core tube. It should be noted that the length of the water vapor barrier film portion folded in from one end of the core tub...

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Abstract

The invention provides a packaging body for a polyvinyl alcohol-based film, the packaging body being capable of suppressing deformation or degradation in the optical performance during storage or transportation. A packaging body (11) is formed by preparing a film roll (3) by wrapping a belt-like polyvinyl alcohol-based film around a core tube (2), attaching protection pads (7) to both ends of thefilm roll (3), and packaging the protection pads (7) and the film roll (3) in a water vapor barrier film (4). Humidity conditioning sheets (8) are attached to the surfaces of the protection pads (7) contacting the film roll (3), and, hence, the film roll (3) is packaged in the water vapor barrier film (4) together with the protection pads (7), to which the humidity conditioning sheets (8) are attached. By packaging the humidity conditioning sheets (8) with the film roll (3), the humidity of an internal space where the film roll (3) is disposed is conditioned to 20 to 80 % RH.

Description

technical field [0001] The present invention relates to a package, a storage or transportation method of a polyvinyl alcohol-based film, a polyvinyl alcohol-based film, and a polarizing film. More specifically, the present invention relates to a package suitable for storage and transportation of a polyvinyl alcohol-based film that is excellent in appearance, has no optical unevenness, and is useful as a raw material for obtaining a polarizing film, and a polyvinyl alcohol using the same A storage or transportation method of the polyvinyl alcohol-based film, a polyvinyl alcohol-based film thus stored and / or transported, and a polarizing film produced using the polyvinyl alcohol-based film. Background technique [0002] Conventionally, polyvinyl alcohol-based films are formed by dissolving polyvinyl alcohol-based resins in solvents such as water, forming films by solution casting (casting), and then drying them with metal heating rolls (hereinafter referred to as metal heating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D81/24B65D85/672G02B5/30
CPCB65D81/22B65D81/05B65D85/672B65D25/00B65H75/04B65H75/18G02B5/30B65D81/24
Inventor 清水俊宏早川诚一郎久保田哲哉
Owner MITSUBISHI CHEM CORP
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